delete drv_airspeed.h (all IOCTLs), airspeed driver lib

- differential pressure now processed downstream like other sensor data (accel/gyro/mag/etc)
 - rename msg differential_pressure -> sensor_differential_pressure
 - add device id and timestamp_sample to all messages
 - calibration performend directly on raw data and SENS_DPRES_OFF parameter updated
 - remove Airspeed base class from existing differential pressure drivers
 - name differential pressure drivers consistently (no _airspeed suffix)

msg/CMakeLists.txt

@@ -51,7 +51,6 @@ set(msg_files
 	commander_state.msg
 	control_allocator_status.msg
 	cpuload.msg
-	differential_pressure.msg
 	distance_sensor.msg
 	ekf2_timestamps.msg
 	ekf_gps_drift.msg
@@ -127,6 +126,7 @@ set(msg_files
 	sensor_baro.msg
 	sensor_combined.msg
 	sensor_correction.msg
+	sensor_differential_pressure.msg
 	sensor_gps.msg
 	sensor_gyro.msg
 	sensor_gyro_fft.msg

msg/airspeed_validated.msg

@@ -1,4 +1,7 @@
-uint64 timestamp				# time since system start (microseconds)
+uint64 timestamp                                # time since system start (microseconds)
+uint64 timestamp_sample
+
+uint32 device_id                                # unique device ID for the sensor that does not change between power cycles
 
 float32 indicated_airspeed_m_s			# indicated airspeed in m/s (IAS), set to NAN if invalid
 float32 calibrated_airspeed_m_s     		# calibrated airspeed in m/s (CAS, accounts for instrumentation errors), set to NAN if invalid

msg/differential_pressure.msg

@@ -1,6 +0,0 @@
-uint64 timestamp				# time since system start (microseconds)
-uint64 error_count				# Number of errors detected by driver
-float32 differential_pressure_raw_pa		# Raw differential pressure reading (may be negative)
-float32 differential_pressure_filtered_pa	# Low pass filtered differential pressure reading
-float32 temperature				# Temperature provided by sensor, -1000.0f if unknown
-uint32 device_id				# unique device ID for the sensor that does not change between power cycles

msg/sensor_differential_pressure.msg

@@ -0,0 +1,10 @@
+uint64 timestamp                     # time since system start (microseconds)
+uint64 timestamp_sample
+
+uint32 device_id                     # unique device ID for the sensor that does not change between power cycles
+
+float32 differential_pressure_pa     # differential pressure reading
+
+float32 temperature                  # temperature in degrees Celsius
+
+uint32 error_count

msg/tools/uorb_rtps_message_ids.yaml

@@ -33,7 +33,7 @@ rtps:
   - msg: debug_vect
     id: 15
     receive: true
-  - msg: differential_pressure
+  - msg: sensor_differential_pressure
     id: 16
   - msg: distance_sensor
     id: 17